Coax-Fed Multiband Dipole. Post 1920.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=d4Hr4vSnkuo. In this video from Stan Gibilisco (W1GV), we see an "elegant but fragile solution to a common conumdrum"--making a monoband dipole antenna capable of operating on several amateur/ham radio bands with only one coaxial cable feed line. With the aid of an antenna transmatch (i.e. "tuner") and a carefully chosen length of 50 ohm coaxial cable as a feed line, it's possible to cover a few HF bands without too much loss. Many of us, myself included, used this arrangement when we needed a simple, inexpensive antenna to get on the air. This arrangement worked fairly well, if one chose 40 meters as the basic antenna. Even without a "tuner", a 40 meter dipole could give passable performance on 15 meters using the third harmonic of of 7 MHz. As Stan points out, the antenna works fairly well, considering the mismatch f...